In a cringe-worthy phone call with the mother of his sexual-assault accuser, the comedian once known as “America’s Dad” boasted of his aberrant inclinations as he described — in graphic detail — how he molested her daughter.

“He called me ‘Mom’ throughout the conversation,” Gianna Constand told jurors on the third day of Cosby’s criminal trial.

“He said, ‘But don’t worry, Mom. There was no penile penetration, just digital penetration.’ It was almost like he was telling me what happened to my daughter, trying to say it was consensual and trying to manipulate it.”

The actor even sickly boasted, “Oh, Mom, she even had an orgasm,” she told jurors.

Gianna first learned in 2005 of daughter Andrea Constand’s claim of Cosby drugging and assaulting her the previous year.

“I was driving to work — my cellphone rang,” Gianna recalled. “[Andrea] yelled into the phone, ‘Mom, I think I’ve got PTSD. She said, ‘Mom, he drugged me and he raped me.’ ”

“I could feel myself start shaking,” the mother testified. “I was shocked with what she had said.”

After getting Cosby on the phone, the livid mother frantically asked what drugs he gave Andrea, who on Tuesday testified that Cosby gave her three blue pills that made her pass out at his home in suburban Philadelphia in January 2004.

“I said, ‘What did you give my daughter? And what did you do to my daughter? And while my daughter was sick, why didn’t you call 911? Why didn’t you call 911?’ ” Gianna recounted.

But Cosby, who claims he is legally blind, told her he couldn’t read the “prescription bottle.” He promised to send her the name of the medication — and then asked that Andrea be put on the line.

“He said, ‘I feel bad telling you this, I sound like a perverted person, I sound like a pervert,’ ” Gianna recalled. “He admitted he was a sick man.”

Gianna admitted that she got “aggressive” on the call, blasting Cosby about what he would have done had Andrea died the evening he plied her with pills — which in court Wednesday prompted the creepy comic to bury his face in his hands.

“He drugged her and put her on the chesterfield [couch] and did whatever he wanted. And then he went to bed,” Gianna told jurors, her voice quavering. “He obviously knew she was unconscious.”
Cosby eventually apologized to the mother and daughter — and offered to pay for Andrea’s therapy.

In a later conversation, he again tried buying off the family — who had met Cosby in 2003 during his performance in Toronto — telling them he would foot the bill for Andrea’s graduate degree.

“It’s important because if you find out that’s what she would like to pursue, I would like to — I would be willing, with your feelings, to set up something even in Toronto or wherever the two of you feel she could go to school,” Cosby told the mom, according to a recording of the Jan. 17, 2005, call that was played in court.

“She’s got to go to school. She’s got to hone those skills,” he said, adding he’d pay as long as she maintained a 3.0 grade-point average.

But the savvy Gianna suddenly turned the conversation back to the three blue pills.

The mom asked Cosby, now 79, if he was ever going to send her the name of the medication he gave Andrea.

But he brushed off the question, saying, “No, we can talk about that later. I wouldn’t even worry about it, I’m serious.”

Gianna said she believed Cosby was in a “state of nervousness . . . because this was another state of wanting to fix this.”

“He said, ‘I feel bad telling you this, I sound like a perverted person, I sound like a pervert,’ ” Gianna recalled. “He admitted he was a sick man.”

The stoic mother burst into tears when prosecutors asked why she had gotten so “aggressive” when she first confronted Cosby on the phone.

“I was very upset because I knew Mr. Cosby mentored her and they were good friends,” she finally said. “She viewed him as a father, he was 10 years older than her own father. I was very distraught that he did that to her, that he drugged her. She did not believe in alcohol and he did that to her. He betrayed her.”

After the alleged assault, Andrea, who worked as the director of basketball operations at Temple University, Cosby’s alma mater and where she had met the star, moved back home to her native Canada.

“It was very, very frequent that she would scream in her sleep or wake up in a sweat,” Gianna said.

“Ma’am, try to answer the questions posed. You can’t comment back to her,” he instructed.

The mother’s testimony came after Andrea stepped down from the witness stand and left the courthouse Wednesday following hours of questioning for the second consecutive day.

Andrea, a 44-year-old massage therapist, remained cool and collected as Agrusa tried to poke holes in her timeline, accusing her of lying to police about when the alleged assault occurred.

In a Jan. 19, 2005, interview with cops in Cheltenham, Pa., Constand claimed she was drugged and molested by Cosby at his ­Elkins Park home on March 16, 2004 — about two months after she now claims the assault took place.

“You were trying to get your dates straight, weren’t you, before you spoke to police?” Agrusa lashed into Constand.

“No, I was not,” she answered.

Agrusa contended that, after poring over her phone records, Constand realized she’d placed nearly 10 calls to various friends the night of March 16 — and then quickly backpedaled on the date of the alleged assault.

Four days later, Constand told police she believed the sex abuse happened between mid-January and February 2004.

“So, once you got ahold of your phone records and realized you could not have been passed out and unconscious, you changed your story,” Agrusa pressed.

“Ma’am, I never got ahold of my phone records,” Constand maintained.

She also walked back a previous claim to police that the assault happened the same night she and Cosby had dinner with a group.

“I was mistaken,” Constand said.

The defense continued to comb through her phone records, claiming that she called Cosby 52 times in the months after the assault, insisting the two had been romantically involved, which Constand denied.

Constand’s testimony was interrupted at one point when attorney Gloria Allred’s cellphone rang — which got the firebrand feminist booted from the strict, no-electronics-allowed courtroom.
“It was off and it rang. I have no idea how it happened,” Allred told The Post.

Allred represents dozens of women who have accused Cosby of sexual assault.

She was eventually let back in after triple-checking that her phone was shut off.